Add test for flattened structs (currently ignored)

schemars/tests/flatten.rs

@@ -0,0 +1,37 @@
+use pretty_assertions::assert_eq;
+use schemars::{schema_for, MakeSchema};
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, PartialEq, MakeSchema)]
+struct Flat {
+    foo: f32,
+    bar: bool,
+    baz: String,
+    foobar: Vec<i32>,
+}
+
+#[derive(Serialize, Deserialize, Debug, PartialEq, MakeSchema)]
+struct Deep1 {
+    foo: f32,
+    #[serde(flatten)]
+    deep2: Deep2,
+    foobar: Vec<i32>,
+}
+
+#[derive(Serialize, Deserialize, Debug, PartialEq, MakeSchema)]
+struct Deep2 {
+    bar: bool,
+    #[serde(flatten)]
+    deep3: Deep3,
+}
+
+#[derive(Serialize, Deserialize, Debug, PartialEq, MakeSchema)]
+struct Deep3 {
+    baz: String,
+}
+
+#[test]
+#[ignore = "flattening is not yet implemented"]
+fn flatten_schema() {
+    assert_eq!(schema_for!(Flat), schema_for!(Deep1));
+}